Hanningfield Reservoir

Hanningfield Reservoir
Aerial view with dam at right
Hanningfield Reservoir
Location	Essex
Coordinates	51°39′30″N 0°30′15″E / 51.65833°N 0.50417°E / 51.65833; 0.50417
Type	reservoir
Primary inflows	240 Ml/d
Primary outflows	210 Ml/d
Basin countries	United Kingdom
Managing agency	Essex and Suffolk Water
Built	1951-57
First flooded	1957
Max. width	3.25 km (2.02 mi)
Surface area	352 ha (870 acres)
Average depth	7.62 m (25.0 ft)
Max. depth	16.76 m (55.0 ft)
Water volume	25,500 million litres (900,000,000 cu ft)
Shore length1	6 mi (9.7 km)
Surface elevation	55 m (180 ft)
Islands	None
Site of Special Scientific Interest
Location	Essex
Grid reference	TQ 730980
Interest	Biological
Area	402.9 ha (996 acres)
Notification	1985
1 Shore length is not a well-defined measure.

Hanningfield Reservoir is a large 25,500-million-litre (900,000,000 cu ft) pumped storage reservoir located between Billericay and Chelmsford in Essex. It has a surface area of 352 hectares (870 acres) and is owned and operated by Essex and Suffolk Water.^[1]

The reservoir is part of a 402.9 ha (996 acres) biological Site of Special Scientific Interest. The site is also owned by Essex and Suffolk Water and is run by them in conjunction with the Essex Wildlife Trust. The reservoir is covered by a Bird Sanctuary Order.^[2][3][4]